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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Bit
-Generated Rock Textures and Their Effect on Evaluation of Lithology, Porosity, and Shows in Drill-Cutting Samples
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During the drilling phase, drill cuttings provide critical data on which costly operational decisions are made. The success or failure of a well may depend on the accuracy of the interpretation of drill-cutting samples comprised of rock fragments 2 mm or less in diameter. These fragments commonly have bit-generated textures that differ substantially from those of the in-situ rocks. Under certain conditions, the bit may pulverize all or part of the rock fabric to produce bit flour, clay, or sand. The processes by which these and other less common bit-generated textures are formed and reach the drill-cutting samples are described. The generation of bit
textures affects the quantitative and qualitative evaluation of the samples. These textures must be recognized to interpret
samples correctly for lithology, porosity, and hydrocarbon shows.
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